通信接口说明

该接口是视频流引擎正常运行时对外依赖的通信接口。该接口由二次开发者实现，并以动态链接库的形式提供。调用示例如下：

// 函数原型声明，实现由客户提供 
using OnNewConnectionCallback = void (*)(int connection);
using RegConnectionCBFunc = int (*)(OnNewConnectionCallback newConnCb);
using CloseConnectionFunc = int (*)(int connection);
using SendFullyFunc = ssize_t (*)(int connection, uint8_t *buf, size_t len); 
using RecvFunc = ssize_t (*)(int connection, uint8_t *buf, size_t len);
const char *soPath = "./libCommunication.so";

//服务端收到新连接回调函数，由云手机引擎提供
//输入参数connection代表新连接的有效句柄
static void OnNewConnection(int conn);

void Test()  
{
    // 动态加载通信动态库的函数符号
    void *handle = dlopen(soPath, RTLD_GLOBAL | RTLD_LAZY | RTLD_NODELETE);
    RegConnectionCBFunc regConnection = (RegConnectionCBFunc)dlsym(handle, "RegConnectionCB");
    CloseConnectionFunc closeConnection = (CloseConnectionFunc)dlsym(handle, "CloseConnection");
    SendFullyFunc sendFully = (SendFullyFunc)dlsym(handle, "SendFully");
    RecvFunc recvData = (RecvFunc)dlsym(handle, "Recv");
    size_t bufSize = 1024; 
    uint8_t *data = malloc(bufSize); 
    // 创建连接，连接服务端 
    int connRet = regConnection(OnNewConnection);  
    // 发送数据
    ssize_t ret = sendFully(conn, data, bufSize); 
    // 接收数据
    ret = recvData(conn, data, bufSize);
    // 释放资源 
    free(data); 
    closeConnection(conn);
    dlclose(handle);
}

各接口的详细描述请参见RegConnectionCB~Recv。